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Thixotropic ink printing quality - ink,online tods shoes buy, print quality - Printing Industry - China CRI Tester
Thixotropic ink is Print The performance of one of the process, it printing quality have greater effect. The so-called thixotropic ink is external and environmental factors in the role and influence, ink thinning or thickening, mobility change phenomenon. The printing process, the stable product quality printing require ink to keep proper and stable liquidity. However, due to inherent factors of ink and printing conditions of the reasons, the printing ink will inevitably occur during the " thixotropic" phenomenon, affecting the stability of product quality. Therefore, the correct understanding of the thixotropic ink, from process, technical measures taken to overcome and compensate for and reduce the extent of thixotropic ink in order to better guarantee the quality of printing products.
Understanding of ink thixotropy Practice in the production process, we found that, generally has certain thixotropic ink, ink were once mainly for the stir friction after thinning to increase liquidity, but put it after a period of static, ink than it will return to its original viscous state. Such as ink viscosity, the agitation in the external force, its coagulation state was destroyed, with a certain mobility. Static state, the growth over time, gradually increase its solidification state, when the re-boot will affect the ink fountain in the normal flow of the phenomenon even can not pass. On the other hand, in the press fountain and ink Cots, And after turning friction, the temperature rises, so mobility, scalability also increased, until transferred to the sheets on, due to the external force disappears, the mobility, scalability, reduced, followed by a dilute thickening, which to ensure the clarity of the printing ink. In addition, the temperature is low, the ink becomes thick; the contrary,nike zvezdochka footwear, the ink on the thinning, to increase liquidity. When the machine is shutdown time, the ink fountain will gradually thickening from the rare form of restitution, which are a normal ink thixotropy.
General in the printing process, the vast majority of printing ink thinning by thick, the temperature change due to factors such as machine temperature,supras skytop, the ink roller temperature, plate temperature and so caused. Have some thixotropy ink when ink is conducive to the smooth, evenly transfer and printing.
Affect the thixotropic ink, in addition to the factors mentioned above, is mainly determined by characteristics of the ink composition, such as strong surface adsorption of pigment ink made its thixotropy on the Great; ink pigments were needle style and the plate than the spherical particles to larger particles thixotropy; paint a large amount of its thixotropy are also great, this is because the pigment molecules are attracted to the flocculation of the reason; pigment wettability and poor links, ink thixotropy also large; resin molecular proportion, and ink thixotropy are also great. In addition, pigment-based ink thixotropy correspondingly large, the reason is too much ink and paint pigment content of poor quality,cheap nike shoe, such as poor wettability, relative density and low power Er Shi ink color. There are links to material when the ink is too small, too small for other reasons, the viscosity will be such problems.
Thixotropic ink printing quality Can be said that the printing quality of ink thixotropy not have a great impact. Production practice, we found that in the printing process, especially in low temperatures, where the machine is slow, the ink fountain there often is not smooth transport for the abnormal phenomenon of ink, resulting in more light ink printed products, affect the stability of the printing ink, which is the main difference between the performance of ink thixotropy. Therefore, we should pay attention to stirring frequently in the ink fountain, keep it continuous, uniform flow and ensure quality ink products.
Do some ink in the transmission process, because of excessive thixotropy, thixotropy phenomenon occurs in its viscosity prior to its higher are likely to lead to block printing ink, paste version of failure. Therefore, some press in the ink fountain is equipped with a blender, mix the ink to " thixotropic" status to improve the flow of ink to reduce the viscosity of ink to prevent ink blocking version, paste version phenomenon. Thixotropy too much ink, the ink printing process more and more rare, more printing ink printed materials more light, almost impossible to adjust, this is not suitable for the printing ink field full version of the printed products, printing should pay attention to this problem.
Control ink thixotropy of technical measures
Printing requirements with the appropriate thixotropic ink, ink thixotropy too big too small will produce an adverse impact on the print.
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